Summary: This has been a great receiver so far. Very easy to set up and the sound that it produces has been fantastic. The only knock, and this is probably just personal preference and maybe I didn't do it exactly right, is the back speakers over-power the center speaker after I sued the auto set-up. It was hard to hear much of the conversation is some movies because of this issue. But, it was easy enough to adjust manually and movies and TV sound great through my Polk Speakers.
Summary: Couldn't be happier with this AVR. I have the Energy Take Classic 5-pack and Energy EW-100 sub for speakers, and they have come alive with the NR-1403. Audyssey setup was very good with only a minor crossover tweak needed for my surround speakers. As others have said the sound is on the rich, mellow sound and the soundstage feels all enveloping. I haven't been able to "max" out the volume, because it would be ear splittingly loud. PLENTY OF POWER for my 20x12 room.
Summary: Very impressed! Awesome receiver. First time with Marantz. Bought this receiver as a replacement of an Onkyo to hook up with my Mirage speakers + Polk Pro Sub. I can say the Marantz performs way, way better than the Onkyo. Marantz has an expectacular sound clarity + richness. Every detail is present, and it is able to match perfectly satelites with sub. Even the image seems a lot sharper. Setup is very easy and menus are very intuitive.